Some imposed fishing limits lifted on drought-impacted Colorado River

79

DENVER | Colorado lifted some fishing restrictions along a stretch of the Colorado River on Tuesday, but biologists warn that historically low water flows caused by a drought in the U.S. West, high water temperatures and wildfire sediment that all starve trout of oxygen could force future bans.

On July 7, Colorado Parks and Wildlife imposed a rare 120-mile (193-kilometer) voluntary fishing ban. Tuesday’s changes allow anglers — a key driver of Colorado’s summer tourist economy — to fish a 27-mile (43-kilometer) stretch of river anytime between midnight and noon, when waters are cooler. Restrictions also have been partially lifted for 50 miles (80 kilometers) upstream.

The changes came after upriver reservoir releases, recent rain and a smaller amount of cold Colorado River headwaters being diverted to the Denver metro area on the eastern side of the Continental Divide, said Kendall Bakich, a Parks and Wildlife aquatic biologist.

Days of smoke from wildfires burning in Western states also has deflected solar radiation that heats up the river, slightly lowering temperatures, Bakich said.

“It’s crazy, but every little bit helps,” she said. “There have been such low flows beginning this spring that the Colorado River looks more like a creek than a river.”

A multitude of factors, nearly all tied to climate change, have left fish in the Colorado River and its many tributaries in a precarious state. Climate change has made the American West much warmer and drier in the past 30 years. While cold-water trout thrive in temperatures below 65 degrees Fahrenheit (18 Celsius), biologists have recorded temperatures surpassing 75 F (24 C).

Colorado’s Western Slope also experienced minimal spring runoff from the high Rocky Mountain snowpack this year — runoff that usually flushes out the river and replenishes high-quality habitat for fish, Bakich said.

“The other phenomenon we’ve never seen is the heating upstream” of tributaries of the Colorado River, she added.

In recent weeks, sediment has been shoved into the waterway by microbursts of rain. That’s particularly the case in Glenwood Canyon, much of which was charred by the 640-square-mile (1,657-square-kilometer) Grizzly Creek Fire last year. Debris lowers oxygen levels in the water and scars the gills of trout, Bakich said.

Affected species include the brown and rainbow trout, mountain whitefish and sculpins that are a food source for the larger fish.

For years, numerous environmental groups have protested the diversion of water to the Denver area, arguing it is harmful to the drought-stricken Colorado River.

Denver Water, the largest state water agency, taps some of that water to serve 1.5 million residents, about a quarter of Colorado’s population. It, too, is seeking ways to meet demand while conserving water amid the drought.

Officials have yet to implement mandatory fishing closures in large part because of a responsible local angling community, Bakich said.

“Our anglers are pretty savvy. They know when conditions are good and not good. The challenge is with people coming from outside the region,” she said.

The voluntary closure earlier this month was running from the town of Kremmling in north-central Colorado to the city of Rifle in the western part of the state. Now, anglers can fish between midnight and noon from State Bridge on the upper Colorado River to Red Dirt Creek west of Glenwood Springs.

 

0 0 vote
Article Rating
Subscribe
Notify of
guest
1 Comment
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
Debra MacKillop
Debra MacKillop
5 days ago

There should be no lifting of fishing restrictions. I am visiting family in Grand Junction, which I often do. The CO River and tributaries in this area are so low you cannot raft and the water temps are extremely warm as a result, terrible for the fish. I checked out 4 lakes while hiking in the Grand Mesa National Forest and the water level in all so low and it’s so warm there were dead fish all over the lake shores and fish crammed together in the lakes with nowhere to go and at the top of the lake, constantly jumping up to get oxygen. Even so, some people were fishing, when you could scoop fish up with a net. These people fishing were sad as clearly the fish populations in those lakes are devastated and why would you try to kill more. The fish also may be sick, for almost being boiled alive. This was at 10,000 feet at Mesa Lake, Lost Lake, Sunset Lake and an unmarked lake. Right now all of us should be working to save the fish populations and help them get through what is a profound environmental crisis that may be the new normal.